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[jira] [Updated] (CASSANDRA-8787) Decrease Default concurrent_compactors from number of CPU

Date

Wed, 11 Feb 2015 16:59:12 GMT

[ https://issues.apache.org/jira/browse/CASSANDRA-8787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
T Jake Luciani updated CASSANDRA-8787:
--------------------------------------
Fix Version/s: 3.0
> Decrease Default concurrent_compactors from number of CPU
> ---------------------------------------------------------
>
> Key: CASSANDRA-8787
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8787
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Sebastian Estevez
> Fix For: 3.0
>
>
> Currently we default concurrent_compactors to the number of avaliable CPUs which means
compactions can theoretically take over all threads and prevent reads and writes from happening.
> I'm currently seeing an extreme case of this that is caused by [6405|https://issues.apache.org/jira/browse/CASSANDRA-6405].
But, in general, this is a bad default. We should probably default concurrent_compactors to
num_cpu to cores/2 or even cores/4.
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